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Zoomed cosmological simulations of Milky Way-sized haloes in f(R) gravity

Published version
Peer-reviewed

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Authors

Arnold, C 
Springel, V 
Puchwein, E 

Abstract

We investigate the impact of f(R) modified gravity on the internal properties of Milky Way sized dark matter halos in a set of cosmological zoom simulations of seven halos from the Aquarius suite, carried out with our code MG-GADGET in the Hu & Sawicki f(R) model. Also, we calculate the fifth forces in ideal NFW-halos as well as in our cosmological simulations and compare them against analytic model predictions for the fifth force inside spherical objects. We find that these theoretical predictions match the forces in the ideal halos very well, whereas their applicability is somewhat limited for realistic cosmological halos. Our simulations show that f(R) gravity significantly affects the dark matter density profile of Milky Way sized objects as well as their circular velocities. In unscreened regions, the velocity dispersions are increased by up to 40% with respect to LCDM for viable f(R) models. This difference is larger than reported in previous works. The Solar circle is fully screened in fR0=−10−6 models for Milky Way sized halos, while this location is unscreened for slightly less massive objects. Within the scope of our limited halo sample size, we do not find a clear dependence of the concentration parameter of dark matter halos on fR0.

Description

Keywords

methods: numerical, cosmology: theory

Journal Title

Monthly Notices of the Royal Astronomical Society

Conference Name

Journal ISSN

0035-8711
1365-2966

Volume Title

462

Publisher

Oxford University Press (OUP)
Sponsorship
VS and CA would like to thank the Klaus Tschira foundation and acknowledge support from the Deutsche Forschungsgemeinschaft (DFG) through Transregio 33, ‘The Dark Universe’. EP gratefully acknowledges support by the Kavli Foundation and the FP7 European Research Council Advanced Grant Emergence-320596. The authors acknowledge CPU-time from the Juelich Supercomputer Centre on the JURECA system.